SECTION 26 0529
Hangers and supports for electrical systems
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LANL MASTER SPECIFICATION
Available online at http://engstandards.lanl.gov
This template must be edited for each project. In doing so, specifier must add job-specific requirements. Brackets are used in the text to indicate designer choices or locations where text must be supplied by the designer. Once the choice is made or text supplied, remove the brackets. The specifications must also be edited to delete specification requirements for processes, items, or designs that are not included in the project -- and specifier’s notes such as these. To seek a variance from requirements in the specifications that are applicable, contact the Engineering Standards Manual Electrical POC. Please contact POC with suggestions for improvement as well.
When assembling a specification package, include applicable specifications from all Divisions, especially Division 1, General requirements.
Specification developed for ML-4 projects. For ML-1, 2, and 3 applications, additional requirements and independent reviews should be added if increased confidence in procurement or execution is desired; see ESM Chapter 1 Section Z10 Specifications and Quality Sections.
This section is for non-seismic supports only. For seismic, use 26 0548.16.
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PART 1 GENERAL
1.1 SECTION INCLUDES
A. Furnish and install, hangers, supports, anchors, concrete bases, and other positive fastenings for electrical components such that gravity loads are safely transferred to the structure.
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Edit the following to match project requirements; delete if no electrical systems or components on the Project require seismic controls (designed anchors).
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1.2 Seismic Controls
A. Refer to Section 26 0548.16 - Seismic Controls for Electrical Systems for hangers, supports, concrete bases, and seismic control for electrical components identified on the Drawings as having seismic designed anchors or braces.
1.3 QUALITY ASSURANCE
A. Furnish and install hangers and supports that conform to the requirements of the following codes and standards:
1. NFPA 70, National Electric Code (NEC)
2. IBC, International Building Code
3. NECA 1, Standard Practices for Good Workmanship in Electrical Contracting
4. Metal Framing Manufacturers Association
a. MFMA-4, Metal Framing Standards Publication
b. MFMA-102, Guidelines for the Use of Metal Framing
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Edit the following to match project requirements.
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1.4 ACTION SUBMITTALS
A. Submit the following in accordance with project submittal procedures.
1. Catalog Data: Submit catalog data for each type of product specified. Include information substantiating equivalent corrosion resistance to zinc coated steel of alternative treatment, finish, or inherent material characteristic.
1.5 Receiving, Storing and Protecting
A. Receive, store, and protect, and handle products according to NECA 1.
PART 2 PRODUCTS
2.1 Substitutions
A. Alternate products may be accepted; follow Section 01 2500, Substitution Procedures.
2.2 COATINGS and Materials
A. Furnish products for use indoors protected with zinc coating or with treatment of equivalent corrosion resistance using approved alternative treatment, finish, or inherent material characteristic.
B. Furnish products for use outdoors or in damp or corrosive indoor locations with hot-dip galvanized coating or with treatment of equivalent corrosion resistance using approved alternative treatment, finish, or material such as stainless steel with inherent corrosion resistant characteristics.
2.3 RACEWAY SUPPORTING DEVICES
A. Furnish supports as described below for the installation of raceway systems.
B. Use pressed steel, single bolt hangers to support individual RMC, IMC or EMT raceways from threaded rods or beam clamps. Manufacturer: Steel City “6H_B Series.”
C. For individual runs of EMT up to trade size 1, above accessible ceilings, use spring steel conduit clips with positive snap closure. Manufacturer: ERICO CADDY “M Series”.
D. Use malleable iron conduit clamps to secure individual RMC, IMC or EMT raceway runs across, parallel, or perpendicular to beams, channels and angle supports. Manufacturer: Steel City “RC, EC, and PC Series”.
E. Use two-piece carbon steel riser clamps for individual vertical raceways passing through floors. Manufacturer: Kindorf “C-210 Series”.
F. Use snap-on type, one-hole steel straps to secure individual raceways up to trade size 2 to flat, dry interior surfaces. Manufacturer: T&B “1210 Series” for RMC and IMC and “4100 Series” for EMT.
G. Use one-hole malleable iron straps to secure individual raceways up to trade size4 to flat, dry interior surfaces. Manufacturer: T&B “1275 Series”.
H. Use one-hole malleable iron straps and conduit spacers to secure individual conduits to flat exterior or damp flat interior surfaces. Manufacturer: T&B “1275 Series” straps with 1350 Series” spacers.
I. Support multiple parallel horizontal conduits with trapeze hangers fabricated from framing channel materials specified below.
2.4 OUTLET BOX SUPPORTING DEVICES
A. Furnish pre-fabricated sheet steel brackets to support outlet boxes from metal studs in dry-wall construction.
B. Single outlet boxes: Provide brackets that are inset to allow for dry-wall ring and have a far-side support leg. Manufacturer: ERICO CADDY “H Series” or “MEB1” attached with “SMS8” low-profile, self-tapping screws.
C. Multiple outlet boxes: Provide brackets that are inset to allow for dry-wall rings and span from stud to stud. Manufacturer: ERICO CADDY “RBS Series” attached with “SMS8” low-profile, self-tapping screws
2.5 HANGER RODS
A. Furnish mild steel rods that conform to ASTM A 307, Standard Specification for Carbon Steel Bolts and Studs, 60 000 PSI Tensile Strength.
B. Furnish rods that are threaded on both ends, threaded on one end, or continuous threaded with UNC (coarse) thread pitch.
C. Provide swivel hangers to eliminate inelastic bending of hanger rods that are not seismically braced.
2.6 Fasteners
A. Pre-set Concrete Inserts
1. Furnish pre-set concrete inserts as shown on the Drawings.
2. Manufacturers:
a. Continuous inserts for wood forms: B-Line “B22I-12” or longer.
b. Spot inserts for wood forms or metal decks: B-Line “B2500” with “N2500” nut, “B2501”
B. Post-installed Concrete Anchors
1. Furnish post-installed expansion, adhesive, and undercut concrete and masonry anchors as shown on the Drawings and Section [05 0521, Post Installed Concrete Anchors – High Confidence] [and/or] [05 0521, Post Installed Concrete and Grouted-Masonry Anchors – Normal Confidence].
2. Power-actuated threaded studs: Use zinc-plated carbon steel or stainless steel suitable for the intended service:
a. 1/4-20 threaded stud: Manufacturer: Hilti X-W6
b. 3/8-16 threaded stud: Manufacturer: Hilti W10
C. Beam Clamps:
1. Furnish beam clamps that are NRTL-listed and compliant with Federal Specification WW-H-171E Type 23 or Manufacturers’ Standardization Society SP-69 and SP-58 Type 23.
2. Provide beam clamps with a locknut on the setscrew.
3. Provide NRTL-listed restraining strap for each beam clamp. Strap shall be not less than 16 gauge thickness, not less than 1 inch wide, and of sufficient length to wrap around the beam flange not less than 1 inch.
D. Hollow Wall Anchors: Furnish zinc-plated steel hollow wall anchors that meet GSA Specification FF-B-588C, Type III.
E. Toggle Bolt Anchors: Furnish zinc-plated steel toggle bolt anchors that meet GSA Specification FF-B-588C, Type I, Class A, Style 1.
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ML-1/2 caution on U-channel systems when using an upgraded version of this section (or if specifying in other sections) for SC/SS nuclear safety related installations:
Based on TRP II project experience, projects should not purchase B-Line (and possibly not competitor) products through a typical distributor who is on the LANL IESL and consider it as meeting NQA-1 due to material traceability problems. Instead, use the CGD method for all of the safety credited components and have sufficient testing and documentation with traceability to allow use. The exception may be Unistrut when NOVA Machine Products, their sole IESL/NQA-1 nuclear-pedigree-line distributor is utilized (verify on current IESL).
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2.7 FRAMING CHANNEL SYSTEMS
A. Furnish U-channel framing systems that conform to MFMA-4 and are fabricated using minimum 12-gage steel.
B. Furnish fittings and accessories that mate and match with U-channel and are of the same manufacturer. Use two-piece, single bolt type conduit straps on U-channel supports.
C. Manufacturers: Unistrut, B-Line, Superstrut.
2.8 FABRICATED SUPPORTING DEVICES
A. Furnish shop- or field-fabricated supports or manufactured supports assembled from U-channel components.
B. Furnish steel brackets fabricated from angles, channels, and other standard structural shapes. Connect with welds and machine bolts to form rigid supports.
PART 3 EXECUTION
3.1 GENERAL
A. Install hangers and supports according to the NEC, IBC, NECA 1, the requirements in this Section, and specific supporting requirements in other Sections.
B. Conform to manufacturer's instructions and recommendations for selection and installation of hangers and supports.
C. Do not use wire or perforated strap for permanent supports.
D. Refer to Section 26 0533 - Raceways and Boxes for Electrical Systems for required flexible sections where raceways cross building expansion joints and where raceways connect to equipment.
E. Do not support conduits, boxes, raceways, etc. from ceiling suspension wires.
3.2 EXAMINATION
A. Examine surfaces to receive hangers and supports for compliance with installation tolerances and other conditions affecting performance of the system. Do not proceed with installation until unsatisfactory conditions have been corrected.
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Edit the following article to match project requirements.
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3.3 FASTENERS
A. Pre-set inserts: Install pre-set inserts for anchoring to reinforced concrete slabs, sides of reinforced concrete beams, and reinforced concrete walls.
B. Post-installed concrete anchors: Install in accordance with Section [05 0521, Post Installed Concrete Anchors – High Confidence] [05 0520, Post Installed Concrete and Grouted-Masonry Anchors – Normal Confidence] and the product’s ICC-ES report conditions of use.
C. Masonry screw anchors: Use in accordance with NECA 1 and the product’s ICC-ES report conditions of use.
D. Power-actuated threaded studs:
1. Use only to fasten clips or straps for individual RMC or IMC conduits trade size 1.5 and smaller or EMT trade size 2.5 and smaller.
2. Install in accordance with the product’s ICC-ES report conditions of use and the manufacturer’s instructions using recommended tools and loads.
3. Use only in uncracked concrete.
4. Install to provide embedment as indicated on the Drawings.
E. Hollow wall anchors: Use hollow wall anchors for fastening to wallboard, plaster or paneling.
F. Toggle bolt anchors: Use toggle bolt anchors for fastening to block, wallboard, or plaster.
G. Use wood screws for fastening to wood construction.
H. Use beam clamps for fastening to structural metal beams, joists, and purlins.
1. Install a restraining strap at each beam clamp. Wrap the restraining strap around the beam flange not less than 1 inch. Where purlins or beams do not provide a secure lip for the restraining strap, secure the strap with a self-tapping screw or by through-bolting.
2. Use a locknut on each beam clamp set screw.
I. Use self-tapping screws or machine bolts, nuts, and washers for fastening to metal studs or metal surfaces.
J. The use of lead-cinch drop in anchors is not allowed.
K. Torque threaded fasteners as recommended by the manufacturer’s instructions.
3.4 RACEWAY SUPPORTS.
A. Install individual and multiple (trapeze) raceway hangers and riser clamps as necessary to support raceways. Provide Ubolts, clamps, attachments, and other hardware necessary for hanger assembly and for securing hanger rods and conduits.
B. Support three or more parallel runs of horizontal raceways together on trapeze hangers.
C. Support individual horizontal raceways by separate conduit hangers.
D. Do not support raceways from ceiling suspension wires.
3.5 BOXES AND CABINETS
A. Support sheet metal boxes directly from the building structure, or by approved brackets or bar hangers, as shown on the Drawings or as required. Where bar hangers are used, attach the bar to structure on opposite sides of the box.
B. In open overhead spaces, cast boxes threaded to raceways need not be supported separately except where used for fixture support.
C. Install surface-mounted cabinets and panelboards as shown on the Drawings or as required.
3.6 Framing Channel Systems
A. Select and install framing channel systems in accordance with MFMA-103.
B. Use framing channel to support electrical equipment that is mounted free of walls.
C. Use framing channel to support equipment mounted on walls that do not have sufficient strength to resist pull-out or wallowing out of equipment mounting bolts.
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Edit the following article to match project conditions; delete if there is no floor-mounted electrical equipment, Concrete bases must be designed by the Engineer of Record based on the properties of the load to be supported, the properties of the supporting structure, the required anchor bolt embedment lengths, etc. Construction details and dimensions for concrete bases must be shown on the Drawings.
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3.7 CONCRETE BASES
A. Install a reinforced concrete base for each piece of floor-mounted electrical equipment. Refer to Section 03 3001, Reinforced Concrete, for materials and installation requirements.
1. Form concrete equipment bases using framing lumber with form release compounds.
2. Construct concrete bases as shown on the Drawings and not less than 4 inches high and not less than 4 inches larger in both directions than the supported equipment.
3. Place pre-set anchors, conduits, and sleeves using the equipment manufacturer's installation template or instructions. Install post-installed anchors in accordance with FASTENERS article above.
4. Place concrete and provide a steel trowel finish on top; chamfer top edges and corners.
B. Cure concrete not less than seven days before installing equipment.
3.8 HANGER RODS
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Coordinate the following article with the Drawings. Delete if there is no suspended equipment.
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A. Use minimum 3/8-inch diameter threaded rod; use larger diameter rod as indicated on the Drawings, in other Sections, or in the supported equipment manufacturer’s installation instructions.
B. Install a locknut at every hanger rod connection.
C. Install swivel hangers at the top of hanger rods that are not seismically braced.
END OF SECTION
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Do not delete the following reference information.
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THE FOLLOWING STATEMENT IS FOR LANL USE ONLY
This project specification section is based on LANL Master Specification Section 26 0529 Rev.6, dated September 25, 2017.
LANL Project I.D. [ ] Hangers and Supports for Electrical Systems
[Rev. 6, September 25, 2017] 26 0529 - 7